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Problem with subnets.

I have a linux router that has 3 adapters, 2 wired one wireless. The wired adapter is connected to a few machines on the network through a switch and works fine. All those machine can access the webserver running on the gateway and can ssh into and ping the gateway using the external ip address. All of the wireless devices can access the internet and ping anything in the outside world just fine. The only thing anything connected to wlan0 can't do is access any service like ssh, apache, or ping the gateway using the external adapter.

I'm thinking it's probably something I need to turn on or allow in iptables to let wlan0 talk to eth0 (the adapter plugged into the modem that has the external ip address). Anything connected to wlan0 can ping the internal ip address and be pinged from anything on the network, it just can't talk to eth0. I just don't know what to do because I rarely mess with iptables.